1. Department of Dermatology, UMCG Center of Expertise for Blistering Diseases University of Groningen, University Medical Center Groningen Groningen the Netherlands
2. Section of Dermatology, Department of Health Sciences University of Florence Florence Italy
3. Dermatology Unit ASST Papa Giovanni XXIII Hospital Bergamo Italy
4. Division of Dermatology Outpatient Consultation for Rare Diseases Trento Italy
5. Faculty of Medicine, Papageorgiou General Hospital, 2nd Dermatology Department, Autoimmune Skin and Bullous Diseases Unit Aristotle University Thessaloniki Greece
6. Faculty of Medicine, Department of Dermatology Akdeniz University Antalya Turkey
7. Faculty of Medicine, Department of Dermatovenereology and Clinic of Dermatovenereology, University Clinical Center of Serbia University of Belgrade Belgrade Serbia
8. I. Department of Dermatovenereology, St. Anna Hospital Masaryk University Brno Czech Republic
9. Dermatology Unit Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
10. Department of Dermatology Technical University Dresden, University Hospital Dresden Germany
11. Department of Dermatology Ospedale classificato Cristo Re Rome Italy
12. Department of Dermatology and Allergology Hannover Medical School Hannover Germany
13. Dermatology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, and Department of Pathophysiology and Transplantation Università Degli Studi di Milano Milan Italy
14. Molecular and Cell Biology Laboratory IDI‐IRCCS Rome Italy
15. Department of Dermatology University of Lübeck Lübeck Germany
16. Department of Dermatology University of Iowa Iowa City Iowa USA
17. Department of Dermatology Universitat de Barcelona, Hospital Clínic de Barcelona Barcelona Spain
18. Department of Dermatology and Lübeck Institute of Experimental Dermatology (LIED) University of Lübeck Lübeck Germany